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title: "Trade and Income: Exploiting Time Series in Geography"
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[James Feyrer (2019)](https://doi.org/10.1257/app.20170616). *American Economic Journal: Applied Economics*.

**Under development — community extension.** This is a provisional source-design assessment, not a new successful replication or a final eligibility ruling.

[Extension index](development.html) · [Provisional eligibility log](development.html#eligibility-log) · [Assessment JSON](aeraej-533.json) · [QMD](aeraej-533.qmd) · [Reproduction code](collection-code.zip)

## Source design and template applicability

Trade growth is instrumented by time-varying geography/predicted trade measures in GDP-growth regressions. Continuous trade exposure is not binary policy adoption.

No DiD estimates, uncertainty intervals or homogeneity-test decision were computed in this tranche. No point is added to the calibration plots. This is not a zero effect or a failed statistical test.

## Recorded treatment-column measurement

**774 distinct nonmissing values** in `openc`.

Trade openness level in deposited Panel_vars.dta; the long-difference regressor is a separately generated analysis variable. N=774; missing=0. Frame: selected_source_data. Source: /Volumes/LAL_BAK/did-cardinality-work/packages/Feyrer_AEJ-Applied_2019_116365/data/Panel_vars.dta.

These are the existing data-measured counts, not counts inferred from design labels. A binary instrument, group indicator or interaction component need not be the treatment of interest; the source-design assessment above takes precedence for template applicability.

## Replication status

**This tranche:** unsupported design; source code/documentation inspected, no estimator run.

**Supplied library:** verified; verification: verified; preparation: needs_helper_files. These are the library’s labels, not new verification claims. Missing data and unsupported designs are separate issues.

## Evidence and provenance

The following files in the supplied library were inspected. Their SHA-256 digests are recorded in the downloadable assessment JSON. Source archives and microdata are not redistributed.

- `AEJ-Applied/Feyrer_AEJ-Applied_2019_116365/R/533_feyrer_replicate.R` (198 lines)
- `AEJ-Applied/Feyrer_AEJ-Applied_2019_116365/verdict.md` (46 lines)
- `AEJ-Applied/Feyrer_AEJ-Applied_2019_116365/aeraej-533.md` (101 lines)